Test-plate for roller-mills



(No Model.)

W. D. GRAY TEST PLATE FOR ROLLER MILLS. No. 273,065. Patented Pb.27, 1883.

may.

N. PETERS. Pholo-L'nhognpher, Washington. ac.

, and the same plane.

UNITED STATES PATENT Farce.

WILLIAM D. GRAY, OF MILVVAUKElE, WISCONSIN.

TEST-PLATE FOR ROLLER-MILLS.

SPECIFICATION forming part of Letters Patent N0. 273,065, d-ated February 27, 1883.

Application filed September 19, 1882. (No model.)

To all whom 2t may concern:

Be it known that 1, WILLIAM D.-GRAY, of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain Improvements in Test-Plates for Roller-Mills, of which the following is a specification.

This invention relates to a device intended to facilitate and determine the accurate relative adjustment of the companion rolls employed i'n roller grinding-mills in such manner as to bring the axes of said rolls to a common plane, tlte device being more particularly designed for use in connection with those rolls which have porcelain surfaces.

My device consists essentially of a plate or frame, preferably cast complete in one piece, adapted to extend from end to end above the rolls, and provided at its two ends with depending flanges or feet adapted to extend downward past the ends of the rolls and rest upon the journals or shafts thereof, the lower surfaces of the feet or flanges being all in one The plate thus constructed may be applied above and. across the two grinding-rolls ot' a mill and sustained by its dependingflanges upon thejournals without coming in contact with the grinding-surfaces of the rolls. The journals of' the rolls being made of equal size, as usual, the plate will rest firmly thereon whenever the two rolls are adjusted with their axes in one and the same plane; butif there bethe slightest deviation from said plane the plate will be free to rock'or tip' upon the journals. It will thus be seen that the operator, in order to insure the proper adjustment of the rolls, has only to place the plate upon their journals and then adjust the rolls until the plate receives a firm and rigid support, which fact is in itself .a positive proof that the rolls are in the required position.

The present device differs from the testplate for which Letters Patent of the United States have been already granted to me, in that the present plate has the downwardly-extending ends adapted to rest upon thejournals of the rolls without touching the surlace, while in the former device the plate came into direct contact with said surface, and was supported thereby.

The present deviceis peculiarly advantageous when used in connection with porcelain rolls and other rolls having mineral surfaces,

which are liable on the one hand to be injured by contact with the plate, and on the other to deface the surface of said plate; also, for use upon rolls which are corrugated or ribbed spirally, and which will not always give a firm support to the platedescribed in my former patent, even when their axes are arranged in line.

Referring to the accompanying drawings, Figure 1 represents a top plan view of my present devicein its preferred form; Fig. 2, a sectional elevation of the same in an operative position on the line to m, Fig. 1; Fig. 3, a sectional elevation of the same in an operative position on the line 3 y, Fg. 1. 1

A A represent the bodies of the grindingrolls, and B B theirjournals or shafts. I

0 represents my test-plate, consisting of a rectangular plate or body, to, having at its two ends depending flanges or feet I), the lower surfaces of which are planed or groundaccurately to one and the same plane.

The plate is made of such length and the flanges of such height as regards the size of the rolls upon which it is to be used that it may be placed in position over and across the rolls, as represented in Fig. 3, with the feet b resting upon the journals of the rolls and sustaining the body a above their grinding-surfaces.

In order to prevent the plate from bending, it is preferred to construct longitudinal flanges c on its edges. The plate is also lightened, and

a view between the rolls permitted, while the plate is thereon, by forming a central opening,

cl, in the body of the plate, as shown. For the sake of convenience in handling the plate, I ordinarly provide the same at the two ends with projecting handles e.

ltis manifest that the form of the plate may be modified as desired, provided only that it is adapted to extend from end to end of the rolls, and provided with supporting feet or flanges adapted to rest upon thejournals of the rolls and sustain said body, the essential requirement being that the device shall be of such character as to rest solidly upon all four journals when the axes of the two rolls concide, but at no other time.

Having thus described my inventionmhat I outof contact with the grinding-surface of said claim isrolls, substantially as described and shown.

1. The improved test-plate for rollermi1ls, 3. The improved test-plate for roller-mills, 1 consisting of a body portion, (1, adapted to exhaving thebodyportion, the dependingfianges 5 tend from end to end above both rolls, and proor feet, adapted, as described, to extend downi vided. with depending flanges or feet adapted Ward past the ends of the rolls, andthe handles to rest in one and the same plane upon the 6, whereby the plate may be adjusted in posijournal of the respective rolls. tion.

2. A test-plate for roller-mills, having at WILLIAM DIGKSEN GRAY. 10 its ends depending feet or flanges adapted to Witnesses:

rest upon the journals of two rolls, and to sus- VVM. W. ALLIS, tain the body portion of the plate above and 1 Sims. ALLIs. 

